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auth.go
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/
auth.go
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package service
import (
"fmt"
"strings"
jwt "github.com/dgrijalva/jwt-go"
)
func ParseAuth(auth string) (token, sub string, err error) {
if strings.HasPrefix(strings.ToLower(auth), "bearer ") {
rawToken := auth[7:]
sub, err = parseSubFromJwtToken(rawToken)
if err != nil {
err = fmt.Errorf("cannot parse subject from bearer: %w", err)
return
}
token = rawToken
return
}
return "", "", fmt.Errorf("cannot parse bearer: prefix 'Bearer ' not found")
}
type claims struct {
Subject string `json:"sub,omitempty"`
}
func (c *claims) Valid() error {
return nil
}
func parseSubFromJwtToken(rawJwtToken string) (string, error) {
parser := &jwt.Parser{
SkipClaimsValidation: true,
}
var claims claims
_, _, err := parser.ParseUnverified(rawJwtToken, &claims)
if err != nil {
return "", fmt.Errorf("cannot get sub from jwt token: %w", err)
}
if claims.Subject != "" {
return claims.Subject, nil
}
return "", fmt.Errorf("cannot get sub from jwt token: not found")
}